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Old 12-24-2014, 10:15 PM   #1
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Brand: Thor Motor Coach
State: West Virginia
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2015 Miramar Furnance

Having difficulty with furnace starting up on my new 2015. I can hear igniters clicking and furnace start but then as soon as igniters stop so does furnace. It goes through multiple cycles of this 12 or times before eventually staying on.
Any Ideas?
kw
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Old 12-24-2014, 11:31 PM   #2
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THOR #121
Might be air in the gas line. If it happens any more turn on your stove top and let it run for a minute than try the furnace.
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Old 12-25-2014, 09:36 AM   #3
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Model: Axis 24.1
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THOR #1150
Is this starting up when its really cold out after it hasn't run in a while? Ours did that on our Axis when I pulled it out of storage for a trip. Seemed to me that it just took those few tries to get the thermocouple warm enough to keep the gas going and keep the furnace on.
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Old 12-31-2014, 12:21 AM   #4
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THOR #1169
Check the gas burner, specifically the venturi. Spiders like to make webs which causes problems.
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Old 12-31-2014, 03:23 PM   #5
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Sounds like there is no gas getting to, or flame, at the thermocouple. Sometimes the thermocouple is located off to one side or the other of the pilot flame, making it difficult to function. A little persuasion of the thermocouple to center it over the pilot flame may help.
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Old 01-03-2015, 01:07 PM   #6
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THOR #902
Thanks for the info.
Do you access the thermo coupler and make adjustments as mentioned by taking off outside cover or do I have to look under furnace from inside unit?
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Old 01-28-2015, 01:42 AM   #7
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THOR #902
OK, It was the thermo coupler cracked. It would fire up sometimes and sometimes not. It took 10 days to get a replacement coupler from Atwood. Atwood stated it was their newest furnace and therefore had no spare parts in supply yet. Sounds like BS but I am now back in operation.
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Old 01-28-2015, 02:23 AM   #8
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Glad you have it running. I have a related question. We bought our RV in Sept. and ran the furnace only with shore power. We have a Four Winds 23U and I am curious, as I watch it snow and freeze outside if the furnace works with just the house battery power. I would look in the manual but the unit is stored at the moment and wont be moving till March. Thanks Ready to Go
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Old 01-28-2015, 07:07 PM   #9
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Quote:
Originally Posted by KNMIB View Post
...I am curious, as I watch it snow and freeze outside if the furnace works with just the house battery power. ..
Built-in RV furnaces are a 12v DC appliance. It will work if the only power you have is the house battery, (typically, about 8-10 hours of furnace use in an insulated motorhome for one 12v deep cell).

When you have hookups your power converter is charging your house battery, (supplementing it), and will simultaneously supply 12v power to all the doodads than use it, (lights, vent fans, tank heaters, water pump, inverter, and furnace).
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Old 01-29-2015, 01:35 AM   #10
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Thanks I am new to this RV stuff and this sight sure helps. Safe Travels
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